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With San Francisco you will not have issues with earphones falling out of your ears or hurting your ear canal. You also avoid the problem of hearing your own voice while you are on the phone. All this is possible because we have been focusing on ergonomics and technology, not only to bring you supreme sound and cool design, but also to give you earphones that allow external sound in. This technology makes it possible for the earphones to "breath" which in turn makes you less isolated from your surroundings.